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Findings from this comparative study include students’ perceived experience on the disruptive behaviour during class by utilizing a questionnaire administered in Norwegian and American schools. The sample in the study is 1153 students between 15-17 years old. We present the student perspective of how students and teachers react towards disruptive behaviour. In both countries, reactions from students indicated a tendency to escalate disruptive behaviour, while the reactions from teachers mostly decreased disruptive behaviour. We analyse these findings in light of the concept of emotional involvement. [ABSTRACT FROM AUTHOR]

'Paediatric bipolar disorder' (PBD) remains controversial; because it is based on the hypothesis that bipolar disorder (BD) often begins in childhood with atypical forms of mania. A meta‐analysis of 12 epidemiological surveys found a high prevalence of PBD among children and adolescents worldwide (1.8%), however, our study of the measurement issues (Child and Adolescent Mental Health, 23, 2018, 14) found that PBD rates were lower than claimed. Our findings are consistent with the developmental trajectory of BD, as described by most longitudinal studies of high‐risk offspring. BD is extremely rare in childhood with nearly all index manic/hypomanic episodes being in midadolescence or later. Treatment for BD should not commence until the first well‐defined manic/hypomanic episode, because children and younger adolescents are extremely sensitive to the side effects of second‐generation antipsychotics including weight gain, metabolic syndrome, extrapyramidal side effects and the risk of cerebral atrophy, as observed in studies of juvenile animals. Read the Editors' introduction at: doi: 10.1111/camh.12315 Read the core debate at: doi: 10.1111/camh.12231; doi: 10.1111/camh.12243; doi: 10.1111/camh.12296 Read more perspectives in this debate at: doi: 10.1111/camh.12318 doi: 10.1111/camh.12317; doi: 10.1111/camh.12316; doi: 10.1111/camh.12313; doi: 10.1111/camh.12310; doi: 10.1111/camh.12314 [ABSTRACT FROM AUTHOR]